|Publication number||US7069079 B2|
|Application number||US 10/422,702|
|Publication date||Jun 27, 2006|
|Filing date||Apr 24, 2003|
|Priority date||Apr 24, 2003|
|Also published as||US20040215266|
|Publication number||10422702, 422702, US 7069079 B2, US 7069079B2, US-B2-7069079, US7069079 B2, US7069079B2|
|Inventors||Chester L. Struble, Pierre A. Grandjean|
|Original Assignee||Medtronic, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (1), Referenced by (11), Classifications (9), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a continuation-in-part of U.S. Application No. 60/333,762, filed Nov. 29, 2001, that has been converted to a nonprovisional application Ser. No. 10/360,765, filed Nov. 29, 2001 now abandoned.
This disclosure relates to multi-site cardiac pacing and more particularly to timing between different pacing sites.
Heart failure is a lifelong condition that affects approximately 5 million people in the United States. Heart failure patients with dilated cardiomyopathy and combined conduction defects such as 1st atrio-ventricular block, left bundle branch block (LBBB), right blundle branch block (RBBB) or intraventricular conduction defects (IVCD) typically demonstrate significant asynchrony between right-ventricle and left-ventricle contraction patterns. The right-ventricle and left-ventricle asynchrony represents a mismatch between right atrio-ventricular and left atrio-ventricular timing indices. The mismatched timing indices typically leads to poor ventricular filling, fusion of atrio-ventricular valve flow characteristics (fusion of E and A waves), increased potential of mitral or tricuspid blood flow regurgitation, and hemodynamic deterioration.
Previous drug treatments for heart failure
Previous multi-site pacing therapies for heart failure involve left-ventricular pacing or bi-ventricular pacing.
For the foregoing reasons, a new approach to regulating atrio-ventricular delay for multi-site pacing is needed.
The pressure regulated atrio-ventricular delay for multi-site pacing improves heart hemodynamic for patients with certain forms of heart disease. The pressure regulated atrio-ventricular delay involves recording atrial activation and ventricle activation, identifying a maximum diastolic pressure, identifying a declination pressure, calculating a percent decrease, and adjusting atio-ventricular delay. The declination pressure occurs at the beginning of an isovolumetric contraction. The percent decrease is calculated between the maximum diastolic pressure and the declination pressure. The atrio-ventricular delay is adjusted according to the percent decrease between the maximum diastolic pressure and the declination pressure.
The first electrical lead is coupled to the feedthrough and configured for positioning in the right ventricle. The first electrical lead has at least a first electrode for pacing the right ventricle, and the first electrical lead can also have additional electrodes for functions such as pacing the right atrium. The first electrode can also serve as a sensing electrode to provide sensing signals of right ventrical timing to the sensing electronics.
The second electrical lead coupled to the feedthrough and configured for positioning in the left ventricle. The second electrical lead has at least a second electrode for pacing the left ventricle, and the second electrical lead can also have additional electrodes for functions such as pacing the left atrium. The second electrode can also serve as a sensing electrode to provide sensing signals of left ventrical timing to the sensing electronics.
The pressure sensor is placed within the right-ventricle, equivalent as used with Implantable Hemodynamic Monitor or Pressure Sensor Brady Pacemaker, will allow real-time pressure monitoring of the total right ventricle. Four specific pressure points can be monitored and hence the sequence of right-ventricle pressure fluctuations can be used to regulate the required atrio-ventricular delay timing.
Ventricular Election and Ventricular Filling Periods. Following ventricular sense or ventricular paced events, maximal (systolic) pressure is measured followed by minimal (end systolic) acute drop in ventricular pressure. Early diastolic phase begins and mitral flow and tricuspid flow gradually start to fill both ventricles as seen via rapid filling period (E wave) and is finally completed via the active filling period (A wave) or atrial kick.
Atrial sensing occures typically following the E wave and atrial contraction occurs resulting in maximal pressure increase when peak diastolic pressure is obtained. Immediately following, the maximal diastolic pressure starts to decrease until the start of the isovolumetric contraction (IVC) period. After a short IVC, the onset of the ventricular contraction betgins and the ventricular ejection occurs.
Detection. Maximal pressure following atrial sense or atrial pace event depicts peak ventricular filling or peak atrial kick pressure during diastolic period. The percent decrease between peak pressure points and declination pressure point determines the moment of atrio-ventricular delay and can be programmed selected as percent of declination. Example of algorithm: 10 mmHg to 7.5 mmHg=a 25% decrease per time interval of 120 ms.
AV Delay Timing. In the example presented, bi-ventricular pacing spiking occurs at 120 ms after peak diastolic pressure of 10 mmHg decreases 25% to 7.5 mmHg marking moment of atrio-ventricular delay timing. Specific timing algorithms can be defined to accommodate for rest and exercise heart rates and percent decrease per time.
Wedge Pressure. In addition, the Pulmonary Capillary Wedge Pressure (PCWP) is by far the most important pressure indices in heart failure patients and their hemodynamics. Through the use of the pressure sensor, PCWP pressure can be estimated from the on-line, 10 Hz sample frequency of right-ventricle pressure measurements, derived by point of maximal dP/dT. The calculated Wedge Pressure (PCWP) can separately be used to regulate the required pacing heart reate, or aid additional fine atrio-ventricular delay tuning when combined with absolute right-ventricle diastolic pressure indicies.
Thus, embodiments of the pressure regulated atrio-ventricular delay for multi-site pacing are disclosed. One skilled in the art will appreciate that the present invention can be practiced with embodiments other than those disclosed. The disclosed embodiments are presented for purposes of illustration and not limitation, and the present invention is limited only by the claims that follow.
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|US20050027322 *||Jul 29, 2003||Feb 3, 2005||Medtronic, Inc.||Mechanically-based interval optimization for a biventricular pacing engine|
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|US8483827||Feb 16, 2012||Jul 9, 2013||Cardiac Pacemakers, Inc.||Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay|
|US8626289||Jun 11, 2013||Jan 7, 2014||Cardiac Pacemakers, Inc.||Method and system for delivering cardiac resynchronization therapy with variable atrio-ventricular delay|
|US8731660||Jan 10, 2011||May 20, 2014||Cardiac Pacemakers, Inc.||Method and system for setting cardiac resynchronization therapy parameters|
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|US20060235481 *||Apr 19, 2005||Oct 19, 2006||Cardiac Pacemakers, Inc.||Selective resynchronization therapy optimization based on user preference|
|US20060247692 *||Apr 28, 2005||Nov 2, 2006||Zhongping Yang||Method and apparatus for optimizing cardiac resynchronization therapy|
|International Classification||A61N1/368, A61N1/365, A61N1/362|
|Cooperative Classification||A61N1/36564, A61N1/3684, A61N1/3627, A61N1/3682|
|Oct 17, 2003||AS||Assignment|
Owner name: MEDTRONIC, INC., MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STRUBLE, CHESTER L.;GRANDJEAN, PIERRE-ANDRE;REEL/FRAME:014056/0626;SIGNING DATES FROM 20030507 TO 20030513
|Jan 6, 2004||AS||Assignment|
Owner name: MEDTRONIC, INC., MINNESOTA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STRUBLE, CHESTER L.;GRANDJEAN, PIERRE-ANDRE;REEL/FRAME:014234/0058;SIGNING DATES FROM 20030507 TO 20030513
|Nov 20, 2009||FPAY||Fee payment|
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|Dec 27, 2013||FPAY||Fee payment|
Year of fee payment: 8